Peripheral section summary
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Peripheral boards
NameDescriptionApplications
2x2 push buttons with LEDs4 tactile push buttons, each with an LED mounted beside it. The LEDs can be either 4×7 mm or SMD-1206 packages. Each LED and switch is individually accessible. Each component has a resistor, pull-up for each switch and a current-limit for each LED.Simple human interface to a µController.
LED array2×4 array of T1, T1 3/4 or SMD (0605, 0805 or 1206 sizes) LEDs.Use wherever up to 8 discrete LEDs need to be driven as indicators.
Power switchSingle push-on/push-off switch.Used in conjunction with any of the 2.x power sources (e.g. vehicle input, 9 V or 3 V sources) to turn power to your circuit on and off, or anywhere else that a SPST switch is needed.
Hex-coded switchTwo 4-bit hex rotary switches, or an 8-bit DIP switch, or many combinations of rotary and DIP switches.Can be used anywhere where one or two 4-bit codes are wanted, e.g. could be used if developing an X-10 receiver. Decimal (BCD) switches can be used instead if needed.
Power FETA pair of medium-power complimentary FETs, each can be driven by a lower power FET to achieve inversion as required.Use to control low to medium voltage, medium power dc loads.
DPDT slide switchSingle mechanical DPDT slide switch.
•Select between two signals, including differential signals, or use to reverse polarity of a balanced line.
•Can also be used as a power switch (only 20 mA max at 20 V, though--the rating is .4VA) if two rails need to be switched.
Rotary encoderA single control knob-rotated shaft encoder. A very small microprocessor is used to sense the encoder's motion. It produces a pair of outputs: CK (clock) and U/D (up/down) to better utilize the encoder's outputs. Traditionally these are used to drive a TTL or CMOS up/down counter, but there is no reason that the clock line can't interrupt a processor which would use the U/D to increment or decrement a software counter (this method is easier than decoding the A and B signals in software). The A and B outputs are also available.Control shaft input. Volume control, etc. in an audio system.
NameDescriptionApplications
Digital pot2, 10 kΩ digital pots. SPI controlled.Stereo volume control, digitally adjustable regulator (in conjunction with a L'il2.01 or L'il2.02), digitally controlled pulse width and/or spacing in a L'il3.1, Op Amp gain control, etc, etc.